[Answer] Jewel Cave National Monument, South Dakota, is the third-longest cave in the world and its largest room is called ______.

Step 1 : Introduction to the question "Jewel Cave National Monument, South Dakota, is the third-longest cave in the world and its largest room is called ______. "

...1. Ape Cave 2. Black Hills Studio 3. the Big Duh 4. the Rec Room

Step 2 : Answer to the question "Jewel Cave National Monument, South Dakota, is the third-longest cave in the world and its largest room is called ______. "

the Big Duh.,:

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